αἰτιολογητέον
From LSJ
ἄνδρες τεθνᾶσιν ἐκ χερῶν αὐτοκτόνων → the men are dead, murdered by their very own hands | dead are our chiefs by fratricidal hands | by kindred hands and mutual murder slain | their hands have killed each other
English (LSJ)
verb. Adj.
A one must investigate causes, Epicur.Ep.1p.29U.
Greek (Liddell-Scott)
αἰτιολογητέον: ῥηματ. ἐπίθ., πρέπει νὰ ἀναζητήσῃ τις τὰς αἰτίας, νὰ δικαιολογήσῃ, νὰ αἰτιολογήσῃ τὸ πρᾶγμα, Διογ. Λ. 10. 80.